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US 2026/0250179 A1Published application
Optical glass and optical element
AssigneeHoya Corporation
InventorsHayato SASAKI, Tomoaki NEGISHI
Life of this patent
Estimating the term…
Abstract
To provide an optical glass having a high refractive index and a relatively low specific gravity, and an optical element. An optical glass which is a SiO2—TiO2—Nb2O5-based glass, and in which the content of SiO2 is 10% by mass or greater, the total content of Na2O, K2O, and Cs2O (Na2O+K2O+Cs2O) is 11.0% by mass or less, and the specific gravity and the refractive index nd thereof satisfy the following formula: nd≥0.2×specific gravity+1.18.
Claims12
Optical glass,
- wherein a content of SiO2 is 10 to 50% by mass,
- a content of TiO2 is 20 to 50% by mass,
- a content of BaO is 0 to 16.38% by mass,
- a content of Nb2O5 is 1 to 50% by mass,
- a total content [Li2O+Na2O+K2O+Cs2O] of Li2O, Na2O, K2O, and Cs2O is 0.1 to 20% by mass,
- a total content [La2O3+Gd2O3+Y2O3] of La2O3, Gd2O3, and Y2O3 is 0 to 10% by mass,
- a total content [TiO2+Nb2O5] of TiO2 and Nb2O5 is 45 to 65% by mass,
- a mass ratio [TiO2/(TiO2+Nb2O5)] of the content of TiO2 to the total content of TiO2 and Nb2O5 is 0.45 or more,
- a mass ratio [Li2O/(Li2O+Na2O+K2O+Cs2O)] of the content of Li2O to the total content of Li2O, Na2O, K2O, and Cs2O is 0.1 to 1,
- an Abbe's number νd is 25 or less, and
- a refractive index nd is 1.86 or more.
8 more elements
Optical glass,
- wherein a content of BaO is less than 15.0% by mass,
- a content of SiO2 is 10 to 50% by mass,
- a content of TiO2 is 1 to 50% by mass,
- a content of Nb2O5 is 1 to 50% by mass,
- a content of Na2O is 0 to 8% by mass,
- a total content [TiO2+Nb2O5] of TiO2 and Nb2O5 is 40 to 80% by mass,
- a mass ratio [TiO2/(TiO2+Nb2O5)] of the content of TiO2 to the total content of TiO2 and Nb2O5 is 0.3 or more,
- a refractive index nd is 1.88 or more, and
- a ratio [Refractive Index nd/Specific Gravity] of the refractive index nd to a Specific Gravity is 0.50 or more.
6 more elements
Optical glass,
- wherein a content of SiO2 is 10 to 50% by mass,
- a mass ratio [Li2O/{100−(SiO2+B2O3+P2O5+GeO2)}] of a content of Li2O to a total content of glass components other than SiO2, B2O3, P2O5, and GeO2 is 0.02 or more,
- a mass ratio
- [TiO2/(TiO2+Nb2O5+WO3+ZrO2+SrO+BaO+ZnO+La2O3+Gd2O3+Y2O3+Ta2O5+Bi2O3)] of a content of TiO2 to a total content of TiO2, Nb2O5, WO3, ZrO2, SrO, BaO, ZnO, La2O3, Gd2O3, Y2O3, Ta2O5, and Bi2O3 is 0.42 or more, and
- a refractive index nd is 1.86 or more.
2 more elements
A light guide plate, comprising:
- the optical glass according to 1.
A light guide plate, comprising:
- the optical glass according to 2.
A light guide plate, comprising:
- the optical glass according to 3.
Dependencies are inferred from the claim text.